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Patients in a double cross‐over in asthma classified by response in each cross‐over for a case in which there is a strong element of personal response.
| Second cross‐over | ||||
|---|---|---|---|---|
| Responder | ||||
| First cross‐over | Yes | No | Total | |
| Responder | Yes | 806 | 40 | 846 |
| No | 31 | 123 | 154 | |
| Total | 837 | 163 | 1000 | |
